FAB Defense GL-CORE M CP Buttstock is a black polymer buttstock with a built-in AR 5.56 magazine carrier and an adjustable cheek rest (3 height levels above the integrated cheek weld), for AR-15/M4 platforms with Mil-Spec or Commercial buffer tubes (tube not included) via interchangeable buffer tube adapters. Features a multi-textured rubber buttpad, ambidextrous QD rear sling swivel connectors, and compatibility with all standard 5.56x45mm/.223 Remington AR15/M16/M4 steel magazines. Includes one Ultimag 10-round AR magazine. The cheek rest is intended for AK, VZ, and shotgun platforms and may obstruct AR-platform charging handle use when the stock is fully collapsed. Safety note Follow all manufacturer installation instructions. Verify proper function and secure mounting before use, especially when using the cheek rest on AR-platform rifles, as it may obstruct charging handle operation when collapsed. Comply with local firearm laws and regulations.